參數(shù)資料
型號: MC68HC705PD6
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PQFP80
封裝: QFP-80
文件頁數(shù): 141/165頁
文件大?。?/td> 841K
代理商: MC68HC705PD6
July 7, 1997
GENERAL RELEASE SPECIFICATION
MC68HC05PD6
TIMER SYSTEM
MOTOROLA
REV 1.1
9-5
The free-running counter is congured to $FFFC during reset and is always a
read-only register. During a power-on reset, the counter is also preset to $FFFC
and begins running after the oscillator start-up delay. Because the free-running
counter is 16 bits preceded by a xed divide-by-four prescaler, the value in the
free-running counter repeats every 262,144 internal bus clock cycles. When the
counter rolls over from $FFFF to $0000, the TOF bit is set. An interrupt can also
be enabled when counter roll over occurs by setting its interrupt enable bit (TOIE).
1
7
1111111
6543210
W
R
CNTH
$0018
reset
CNT15
CNT14
CNT13
CNT12
CNT11
CNT10
CNT9
CNT8
1
7
1111100
6543210
W
R
CNTL
$0019
reset
CNT7
CNT6
CNT5
CNT4
CNT3
CNT2
CNT1
CNT0
1
7
1111111
6543210
W
R
ACNTH
$001A
reset
ACNT15
ACNT14
ACNT13
ACNT12
ACNT11
ACNT10
ACNT9
ACNT8
1
7
1111100
6543210
W
R
ACNTL
$001B
reset
ACNT7
ACNT6
ACNT5
ACNT4
ACNT3
ACNT2
ACNT1
ACNT0
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